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#75 New PHP syntax highlighting

Being a bit disappointed with the php.jsf file
submitted in joe distribution, I wrote a new one.
These features were added:
- liting of variables within double quoted strings (all
three syntaxes)
- several liting classes of different operators
- different liting classes for different types of comments
- liting of superglobals
- added a few missing keywords
- liting of variables
- liting of transitions between PHP and raw
These features were dropped:
- liting of string escapes